The use of 30 caliber barrel stock is how we sometimes find a Luger with a 308 groove diameter as opposed to the original 311. This is fine with current factory ammo as Fiocchi runs 308 nominal and Winchester runs 309 both nominal and max. It would be a bit iffy for ammo that has a 310, 311 or 312 bullet.
The original DWM barrels seem to be pretty good. I can imagine that repro barrels could vary in quality and diminsions. Some of them are 308.
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